Finance costs and fair value change in derivative instruments - Summary of Detailed Information About Finance costs and Fair Value Change in Derivative Instruments (Parenthetical) (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
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| Disclosure Of Detailed Information About Finance Cost And Fair Value Change in Derivative Instruments [Abstract] | |||
| Interest expense on lease liabilities | ₨ 615 | ₨ 690 | ₨ 416 |